Math CoTeacher finds the misconceptions hiding behind your students' correct answers and tells you exactly what to do about it in your lesson tomorrow.
You sense that some students are nailing their procedures but don’t really get the concepts. Your pacing guide is unrelenting so there’s no time to re-teach or pull kids aside. You might have even seen it in the data. But then what do you do about it? You would burn out trying to differentiate every lesson. You’re in an impossible position.
When a student gets the answer right, most tools move on. Math CoTeacher looks underneath to see whether their reasoning is made of brick or sand.
"Thirteen years in the classroom. MAP, iReady, IXL could all tell me my students were behind. None understood why, or could help me close the gap. So I built something that does."
Mark · Founder, Math CoTeacher · 13 years teaching from K to 6th grade
I want Math CoTeacher to work for every last one of your students. If you sign up for early access, I'll work with you directly to make that happen. You tell me what's not working, I'll fix it.
Math CoTeacher interviews each student one-on-one, figures out where their thinking breaks down, and tells you exactly what to do about it in your next lesson.
Pick a topic. MCT generates a short conversation that digs beneath right and wrong answers to uncover how each student actually thinks.
Takes you about 2 minutes to set up.Each student completes their interview on their own time. MCT maps their reasoning: what's solid, what's fragile, and what's missing entirely.
Students spend 10-20 minutes. You spend zero.Open your dashboard before class. Your next lesson, already differentiated for your students. No extra planning.
Ready before your first period."I don't have time to learn another tool."
There's nothing to learn. Pick a topic, assign an interview, check your dashboard. If you can use Google Classroom, you can use this.
"Is this just an app that makes things up?"
Math CoTeacher is built on Arithmetic to Algebra, a clinical assessment framework used for over a decade with proven results. It doesn't guess. It follows the same structured interview protocol a trained specialist would use, and every analysis traces back to what the student actually said.
"Will my district approve this?"
Student data privacy is baked in from day one. We're happy to work with your admin team during early access to make sure everything meets your district's requirements.
"Does it work with my existing curriculum?"
Yes. MCT integrates directly with your curriculum. The insight it gains about your students today can show up directly into your lesson plans tomorrow. All without you lifting a finger.
Follow one student's hidden misconception from interview to the teacher's morning dashboard.
Jaylen, a 5th grader, gets the right answer. Watch MCT's interview uncover the fragile reasoning underneath. The kind that breaks in 7th grade.
What Ms. Thompson sees at 7:15 AM before first period. Ready to use, no interpretation needed.
What Jaylen's mom receives that evening. A clear picture of how her son thinks.
Each takes 2–5 minutes. No account needed.
Be one of the first teachers to try it.
Before I send this to Mark: are you 18 or older?
I love that you are interested in Math CoTeacher, but I can't store contact info for anyone under 18. Grab a parent, guardian, or teacher, tell them why you're interested, and have them reach out for you!